Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands	Total USD ($)	Common Stock USD ($)	Treasury Stock	Additional Paid-in Capital USD ($)	Accumulated Other Comprehensive (Loss)/Income USD ($)	Retained Earnings USD ($)
Beginning balance at Apr. 30, 2013	$ 241,349	$ 7		$ 370,397	$ (146)	$ (128,909)
Beginning balance, Shares at Apr. 30, 2013		73,925	(250)
Excess tax benefit related to stock-based expense	96			96
Stock-based expense	10,996			10,996
Issuance of restricted stock awards		76
Exercise of stock options and vested restricted stock units	8,955	1		8,954
Exercise of stock options and vested restricted stock units, shares		2,954
Shares issued under employee stock plans (in shares)		152
Shares issued under employee stock plans	1,043			1,043
Change in foreign currency translation adjustment	269				269
Change in unrealized loss on investments	90				90
Net loss	(39,485)					(39,485)
Ending balance at Jan. 31, 2014	$ 223,313	$ 8		$ 391,486	$ 213	$ (168,394)
Ending balance, Shares at Jan. 31, 2014		77,107	(250)